Example 21
A dock worker piles 100 kg of salmon at 10°C into a
freezer with a coefficient of performance of 8.6. The
compressor delivers 500 W of power continuously. The
specific heat of the fish is 2.98 kJ/kg°C. The fish freezes
at 2.2°C with a latent heat of fusion of 214 kJ/kg.
a) how long will it take for the fish to reach the
freezing point?
b) how long will it take for the fish to be frozen solid?
Solution:
a) The rate of heat removal from the salmon is
()
in
in
QC
O
P
W
=
±
±
(
)
8.6 500W
4300W
in
Q
==
±
The total heat needed to cool the salmon to the freezing
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 Spring '08
 Kaminski
 Thermodynamics, 1kJ, 2.2°C, 2.98 kJ

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